InChI=1S/C20H18O8S/c1-12(11-27-29(24,25)26)7-8-14-16(21)10-17-19(20(14)23)15(9-18(22)28-17)13-5-3-2-4-6-13/h2-7,9-10,21,23H,8,11H2,1H3,(H,24,25,26)